Adhesion of the geopolymer composites to concrete, steel and ceramics

Danuta Wala, Genowefa Rosiek Politechnika Wrocławska, Instytut Budownictwa, pl. Grunwaldzki 11, 54-440 Wrocław, Poland

Quarterly No. 1, 2008 pages 36-40

DOI:

keywords: geopolymers, composites, adhesion

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abstract This paper analyses the influences of temperature on mechanical properties of geopolymer composites designed to joining various materials. Metakaolinite and fly ashes from the power plant „Łaziska” and „Rybnik” were applied as the precursor in studied geopolymers. Fine-grained powders about grain-size distribution < 100 m (the milled sand and powder of the iron and chromium) were fillers. The alkalizing solution was the water glass (about module 3.3, density 1.38 g/cm3) with the addition of the sodium hydroxide. Six alkali activated mixture were prepared to investigation. For prepared geopolymer composites the bending and compressive strength depending on the curing temperature (65, 200, 400, 800C) were measured. The composite including as precursor equilibrium mixture of the metakaolinite and the flay ash (Łaziska) with precipitation the milled quartz sand as filler showed the highest thermal resistance and increase compressive strength with the growth of the temperature. All studied geopolymer composites showed the considerable decrease of the bending strength after heating at 200C, and then essential increase after the curing at the temperature 400C. The joining properties studied composites after the curing at 65 and 400C was estimated by the measurement shear strength in joints: ceramics-ceramics, metal- -metal, metal-ceramics, concrete-concrete. All studied joints after heating at 65C show the shear strength within the range 4.97.4 MPa for optimum compositions. After heating at 400C the shear strength of joints significance decreased, in the smallest rate for connections ceramics-ceramics and in the largest for connections the metal-ceramics.